Gable Roof Truss Design

After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors.

Gable roof truss design.

The top chord smoothly extends out past the wall to create the overhang. Gable trusses are more expensive than common structural trusses because more lumber is required. A gable truss sits on the end wall of a structure and has vertical studs every 2 feet or 16 inches. For larger structures like floors roofs or decks try a fink truss design which has internal joists arranged in a w shape for extra support.

The truss sides will be equal in length and width to fit equally on the shed walls. The gable shed has a roof like a house so the roof trusses will have a peak in the middle. Sheet gable end trusses remove the screws holding the truss rafters to the floor flip it over and put it back in place aligned with the simulated to plate. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters.

They re often placed at the front and back of each other with the front pitch usually steeper. This is used for gable roofs. Lay the first piece of siding on the truss assembly and allow 2 inches of overhang below the bottom of the simulated top plate. This is similar to the gable shed because the trusses will be in two different cuts because of the two different angles.

Finally there is a barn type or gambrel shed roof. A pitch truss with two sets of different sloping sides. If you re trying to reinforce a shed or gable roof use a simple king post truss design which has a single vertical joist running through the center of the triangular frame. For a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.

Gable roof framing calculator plan diagram with full dimensions.